//------------------------------------------------------------------------------ 
//  <copyright file="Utility.cpp" company="Microsoft Corporation">
// The MIT License (MIT)
// 
// Copyright (c) 2014, Microsoft Corporation
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//  </copyright>
//------------------------------------------------------------------------------
#pragma once
#include "..\stdafx.h"
using namespace System::Runtime::InteropServices;

#include "RGBCameraEnumerator.h"
#include "SourceReaderCallback.h"
#include "RGBCamera.h"

#include "ks.h"
#include "ksmedia.h"
#include "MediaFoundationUtility.h"

namespace Microsoft {
    namespace Robotics {
        namespace Vision {
            namespace Cameras {
				namespace Webcam {

    /// <summary>
    ///  This looks up a specified string attribute on an attribute object
    /// </summary>
    ///<params name="pAttributes">The attribute store to read from</params>
    ///<params name="key">The attribute key to look up</params>
    ///<returns>The string representation of the attribute. </returns>
    ///<exceptions> KeyNotFoundException - no attribute was found </exceptions>
    String^ MediaFoundationUtility::GetStringProperty(IMFAttributes* pAttributes, REFGUID key)
    {
        HRESULT hr = S_OK;
        PROPVARIANT var = {0};

        try
        {
            hr = pAttributes->GetItem(key, &var);
            MF_THROWHR(hr);

            if (var.vt != VT_LPWSTR)
            {
                return nullptr;
            }
            return gcnew String(var.pwszVal);
        }
        finally
        {
            PropVariantClear(&var);
        }
    }
}}}}}
    
